Malicious PDF — malware analysis report

Static analysis result for SHA-256 68d5fcd3125aa813…

MALICIOUS

PDF

74.9 KB Created: 2021-09-13 16:24:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d971bed047a791ca83d6e9a8e3744bb2 SHA-1: 979ba1db21094b20550710c17496dc97427a14a8 SHA-256: 68d5fcd3125aa81311c8f27542baf4bfef80d5fb48c3800c8e1b40b03c185c48
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing attempt. It contains embedded JavaScript and links to external resources, some of which point to compromised CMS upload storage. The presence of a visual download button suggests a lure to trick the user into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/supawaseleguz.pdf In PDF document text
    • http://lex.tj/img/file/rebipujovapivarizoxemuse.pdfIn PDF document text
    • http://indel.sk/userfiles/file/14880783979.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130da1564a63---34133464110.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/70483709453.pdfIn PDF document text
    • http://cmtsport.com/pliki/jomozililolujeberoxenoda.pdfIn PDF document text
    • https://euroialinsol.ro/userfiles/file/84921537600.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/12248056610.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec2b9ba9d7---3026561333.pdfIn PDF document text
    • https://illustrations.noche.fr/images/files/tizerimiguko.pdfIn PDF document text
    • http://isleford.com/filespath/files/20210905113509.pdfIn PDF document text
    • https://cakkue.com/contents/files/42197992471.pdfIn PDF document text
    • http://cassotech.nl/site/data/ws/files/rafuvegenimesezilina.pdfIn PDF document text
    • http://malerbetrieb-malanders.de/Webseite/pics/fotos/1/file/gojeno.pdfIn PDF document text
    • http://vocal.bpv.su/content/files/files/85188969101.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/7b775431533a3ff40cf928de33014503/pufenof.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/54417974833.pdfIn PDF document text
    • http://flirtproducties.nl/ckfinder/userfiles/files/moditupalupolo.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9d818d856---78063863564.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/7b58d17df3814bbff9f4752653d1d45e/tutur.pdfIn PDF document text
    • https://unitytradecapital.com/ckfinder/userfiles/files/82338275557.pdfIn PDF document text
    • http://na3.it/misc/file/77543598154.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=wild+rift+modPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC427 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC39 17260 bytes
SHA-256: f8a3e3c31faba5a464a59722179045293c7e30e7405960a1f673250f394d9266
font_02_sfnt_off000108c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C4 9940 bytes
SHA-256: 2ee2e7c5c5c68b8396eea37cf63576423a250fc2d12a241d0d244f68412caa57

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